I think it's funny that we're on the BIKEforum's and many refer to their equipment as a BIKE vs a bicycle, so what's wrong with being called a BIKE-er. Any time I have a casual conversation with a stranger, casual acquaintance I eventually have to back PEDAL and explain "no a BIcycle!" So maybe bicycle and cyclist would be more clear, but cyclist sounds so professional. At the end of the day, I'm just a dude that enjoys his bike, so call me a biker if you like.